Photoemission Spectrum in the BCS–BEC Crossover Regime of a Rare-Earth Fermi Gas with an Orbital Feshbach Resonance

We theoretically investigate photoemission spectrum (PES) in a 173Yb Fermi gas with a tunable pairing interaction associated with an orbital Feshbach resonance. Including the two-channel character of this rare-earth atomic system, we examine strong-coupling effects on single-particle properties of t...

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Bibliographic Details
Published in:	Journal of the Physical Society of Japan 2018-09, Vol.87 (9), p.94301
Main Authors:	Mondal, Soumita, Inotani, Daisuke, Ohashi, Yoji
Format:	Article
Language:	eng
Subjects:	Approximation Coupling Crossovers Fermi gases Inhomogeneity Magnetic resonance Mathematical analysis Open channels Orbital resonances (celestial mechanics) Photoelectric emission Rare earth elements Spectrum analysis Studies Trace elements Variation
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Summary:	We theoretically investigate photoemission spectrum (PES) in a 173Yb Fermi gas with a tunable pairing interaction associated with an orbital Feshbach resonance. Including the two-channel character of this rare-earth atomic system, we examine strong-coupling effects on single-particle properties of the open and closed channels, within the framework of an T-matrix approximation in terms of fluctuations in the Cooper channel. In the BCS–BEC crossover region, PES in the closed channel is shown to exhibit non-vanishing intensity in the negative energy region, as an effect of pairing fluctuations. On the other hand, PES in the open channel exhibits a pseudogap phenomenon, as in the case of a broad magnetic Feshbach resonance discussed in 40K and 6Li Fermi gases. We also examine effects of a harmonic trap in the local density approximation, to see how the spatial inhomogeneity affects strong-coupling corrections to PES.
ISSN:	0031-9015 1347-4073